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<title>class Fiddle::CStructEntity - fiddle: Ruby Standard Library Documentation</title>


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  <p class="link"><a href="Pointer.html">Fiddle::Pointer</a>
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<!-- Method Quickref -->
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  <h3>Methods</h3>

  <ul class="link-list" role="directory">
    <li ><a href="#method-c-alignment">::alignment</a>
    <li class="calls-super" ><a href="#method-c-malloc">::malloc</a>
    <li class="calls-super" ><a href="#method-c-new">::new</a>
    <li ><a href="#method-c-size">::size</a>
    <li class="calls-super" ><a href="#method-i-5B-5D">#[]</a>
    <li class="calls-super" ><a href="#method-i-5B-5D-3D">#[]=</a>
    <li ><a href="#method-i-assign_names">#assign_names</a>
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    <main role="main" aria-labelledby="class-Fiddle::CStructEntity">
    <h1 id="class-Fiddle::CStructEntity" class="class">
      class Fiddle::CStructEntity
    </h1>

    <section class="description">
    
<p>A pointer to a C structure</p>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">





                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-alignment" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">alignment</span><span
                                class="method-args">(types)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="alignment-source">
            <pre><span class="ruby-comment"># File fiddle/lib/fiddle/struct.rb, line 277</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">CStructEntity</span>.<span class="ruby-identifier ruby-title">alignment</span>(<span class="ruby-identifier">types</span>)
  <span class="ruby-identifier">max</span> = <span class="ruby-value">1</span>
  <span class="ruby-identifier">types</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">type</span>, <span class="ruby-identifier">count</span> = <span class="ruby-value">1</span><span class="ruby-operator">|</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">type</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:entity_class</span>)
      <span class="ruby-identifier">n</span> = <span class="ruby-identifier">type</span>.<span class="ruby-identifier">alignment</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">n</span> = <span class="ruby-constant">ALIGN_MAP</span>[<span class="ruby-identifier">type</span>]
    <span class="ruby-keyword">end</span>
    <span class="ruby-identifier">max</span> = <span class="ruby-identifier">n</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">n</span> <span class="ruby-operator">&gt;</span> <span class="ruby-identifier">max</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">max</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-malloc" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">malloc</span><span
                                class="method-args">(types, func = nil, size = size(types)) { |struct| ... }</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Allocates a C struct with the <code>types</code> provided.</p>

<p>See <a href="Pointer.html#method-c-malloc"><code>Fiddle::Pointer.malloc</code></a> for memory management issues.</p>
                                <div class="method-calls-super">
                                  Calls superclass method
                                  <a href="Pointer.html#method-c-malloc"><code>Fiddle::Pointer::malloc</code></a>
                              </div>

                              <div class="method-source-code" id="malloc-source">
            <pre><span class="ruby-comment"># File fiddle/lib/fiddle/struct.rb, line 293</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">CStructEntity</span>.<span class="ruby-identifier ruby-title">malloc</span>(<span class="ruby-identifier">types</span>, <span class="ruby-identifier">func</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">size</span> = <span class="ruby-identifier">size</span>(<span class="ruby-identifier">types</span>), <span class="ruby-operator">&amp;</span><span class="ruby-identifier">block</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">block_given?</span>
    <span class="ruby-keyword">super</span>(<span class="ruby-identifier">size</span>, <span class="ruby-identifier">func</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">struct</span><span class="ruby-operator">|</span>
      <span class="ruby-identifier">struct</span>.<span class="ruby-identifier">set_ctypes</span> <span class="ruby-identifier">types</span>
      <span class="ruby-keyword">yield</span> <span class="ruby-identifier">struct</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">struct</span> = <span class="ruby-keyword">super</span>(<span class="ruby-identifier">size</span>, <span class="ruby-identifier">func</span>)
    <span class="ruby-identifier">struct</span>.<span class="ruby-identifier">set_ctypes</span> <span class="ruby-identifier">types</span>
    <span class="ruby-identifier">struct</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-new" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">new</span><span
                                class="method-args">(addr, types, func = nil)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Wraps the C pointer <code>addr</code> as a C struct with the given <code>types</code>.</p>

<p>When the instance is garbage collected, the C function <code>func</code> is called.</p>

<p>See also <a href="Pointer.html#method-c-new"><code>Fiddle::Pointer.new</code></a></p>
                                <div class="method-calls-super">
                                  Calls superclass method
                                  <a href="Pointer.html#method-c-new"><code>Fiddle::Pointer::new</code></a>
                              </div>

                              <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File fiddle/lib/fiddle/struct.rb, line 340</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">addr</span>, <span class="ruby-identifier">types</span>, <span class="ruby-identifier">func</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">func</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">addr</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Pointer</span>) <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">addr</span>.<span class="ruby-identifier">free</span>
    <span class="ruby-identifier">raise</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-string">&#39;free function specified on both underlying struct Pointer and when creating a CStructEntity - who do you want to free this?&#39;</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">set_ctypes</span>(<span class="ruby-identifier">types</span>)
  <span class="ruby-keyword">super</span>(<span class="ruby-identifier">addr</span>, <span class="ruby-ivar">@size</span>, <span class="ruby-identifier">func</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-size" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">size</span><span
                                class="method-args">(types)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Returns the offset for the packed sizes for the given <code>types</code>.</p>

<pre class="ruby"><span class="ruby-constant">Fiddle</span><span class="ruby-operator">::</span><span class="ruby-constant">CStructEntity</span>.<span class="ruby-identifier">size</span>(
  [ <span class="ruby-constant">Fiddle</span><span class="ruby-operator">::</span><span class="ruby-constant">TYPE_DOUBLE</span>,
    <span class="ruby-constant">Fiddle</span><span class="ruby-operator">::</span><span class="ruby-constant">TYPE_INT</span>,
    <span class="ruby-constant">Fiddle</span><span class="ruby-operator">::</span><span class="ruby-constant">TYPE_CHAR</span>,
    <span class="ruby-constant">Fiddle</span><span class="ruby-operator">::</span><span class="ruby-constant">TYPE_VOIDP</span> ]) <span class="ruby-comment">#=&gt; 24</span>
</pre>

                              <div class="method-source-code" id="size-source">
            <pre><span class="ruby-comment"># File fiddle/lib/fiddle/struct.rb, line 313</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">CStructEntity</span>.<span class="ruby-identifier ruby-title">size</span>(<span class="ruby-identifier">types</span>)
  <span class="ruby-identifier">offset</span> = <span class="ruby-value">0</span>

  <span class="ruby-identifier">max_align</span> = <span class="ruby-identifier">types</span>.<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">type</span>, <span class="ruby-identifier">count</span> = <span class="ruby-value">1</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">last_offset</span> = <span class="ruby-identifier">offset</span>

    <span class="ruby-keyword">if</span> <span class="ruby-identifier">type</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:entity_class</span>)
      <span class="ruby-identifier">align</span> = <span class="ruby-identifier">type</span>.<span class="ruby-identifier">alignment</span>
      <span class="ruby-identifier">type_size</span> = <span class="ruby-identifier">type</span>.<span class="ruby-identifier">size</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">align</span> = <span class="ruby-constant">PackInfo</span><span class="ruby-operator">::</span><span class="ruby-constant">ALIGN_MAP</span>[<span class="ruby-identifier">type</span>]
      <span class="ruby-identifier">type_size</span> = <span class="ruby-constant">PackInfo</span><span class="ruby-operator">::</span><span class="ruby-constant">SIZE_MAP</span>[<span class="ruby-identifier">type</span>]
    <span class="ruby-keyword">end</span>
    <span class="ruby-identifier">offset</span> = <span class="ruby-constant">PackInfo</span>.<span class="ruby-identifier">align</span>(<span class="ruby-identifier">last_offset</span>, <span class="ruby-identifier">align</span>) <span class="ruby-operator">+</span>
             (<span class="ruby-identifier">type_size</span> <span class="ruby-operator">*</span> <span class="ruby-identifier">count</span>)

    <span class="ruby-identifier">align</span>
  }.<span class="ruby-identifier">max</span>

  <span class="ruby-constant">PackInfo</span>.<span class="ruby-identifier">align</span>(<span class="ruby-identifier">offset</span>, <span class="ruby-identifier">max_align</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-5B-5D" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">[]</span><span
                                class="method-args">(*args)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Fetch struct member <code>name</code> if only one argument is specified. If two arguments are specified, the first is an offset and the second is a length and this method returns the string of <code>length</code> bytes beginning at <code>offset</code>.</p>

<p>Examples:</p>

<pre class="ruby"><span class="ruby-identifier">my_struct</span> = <span class="ruby-identifier">struct</span>([<span class="ruby-string">&#39;int id&#39;</span>]).<span class="ruby-identifier">malloc</span>
<span class="ruby-identifier">my_struct</span>.<span class="ruby-identifier">id</span> = <span class="ruby-value">1</span>
<span class="ruby-identifier">my_struct</span>[<span class="ruby-string">&#39;id&#39;</span>] <span class="ruby-comment"># =&gt; 1</span>
<span class="ruby-identifier">my_struct</span>[<span class="ruby-value">0</span>, <span class="ruby-value">4</span>] <span class="ruby-comment"># =&gt; &quot;\x01\x00\x00\x00&quot;.b</span>
</pre>
                                <div class="method-calls-super">
                                  Calls superclass method
                                  <a href="Pointer.html#method-c-5B-5D"><code>Fiddle::Pointer::[]</code></a>
                              </div>

                              <div class="method-source-code" id="5B-5D-source">
            <pre><span class="ruby-comment"># File fiddle/lib/fiddle/struct.rb, line 413</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">[]</span>(<span class="ruby-operator">*</span><span class="ruby-identifier">args</span>)
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">super</span>(<span class="ruby-operator">*</span><span class="ruby-identifier">args</span>) <span class="ruby-keyword">if</span> <span class="ruby-identifier">args</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">&gt;</span> <span class="ruby-value">1</span>
  <span class="ruby-identifier">name</span> = <span class="ruby-identifier">args</span>[<span class="ruby-value">0</span>]
  <span class="ruby-identifier">idx</span> = <span class="ruby-ivar">@members</span>.<span class="ruby-identifier">index</span>(<span class="ruby-identifier">name</span>)
  <span class="ruby-keyword">if</span>( <span class="ruby-identifier">idx</span>.<span class="ruby-identifier">nil?</span> )
    <span class="ruby-identifier">raise</span>(<span class="ruby-constant">ArgumentError</span>, <span class="ruby-node">&quot;no such member: #{name}&quot;</span>)
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">ty</span> = <span class="ruby-ivar">@ctypes</span>[<span class="ruby-identifier">idx</span>]
  <span class="ruby-keyword">if</span>( <span class="ruby-identifier">ty</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Array</span>) )
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">ty</span>.<span class="ruby-identifier">first</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:entity_class</span>)
      <span class="ruby-keyword">return</span> <span class="ruby-ivar">@nested_structs</span>[<span class="ruby-identifier">name</span>]
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">r</span> = <span class="ruby-keyword">super</span>(<span class="ruby-ivar">@offset</span>[<span class="ruby-identifier">idx</span>], <span class="ruby-constant">SIZE_MAP</span>[<span class="ruby-identifier">ty</span>[<span class="ruby-value">0</span>]] <span class="ruby-operator">*</span> <span class="ruby-identifier">ty</span>[<span class="ruby-value">1</span>])
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">ty</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:entity_class</span>)
    <span class="ruby-keyword">return</span> <span class="ruby-ivar">@nested_structs</span>[<span class="ruby-identifier">name</span>]
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">r</span> = <span class="ruby-keyword">super</span>(<span class="ruby-ivar">@offset</span>[<span class="ruby-identifier">idx</span>], <span class="ruby-constant">SIZE_MAP</span>[<span class="ruby-identifier">ty</span>.<span class="ruby-identifier">abs</span>])
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">packer</span> = <span class="ruby-constant">Packer</span>.<span class="ruby-identifier">new</span>([<span class="ruby-identifier">ty</span>])
  <span class="ruby-identifier">val</span> = <span class="ruby-identifier">packer</span>.<span class="ruby-identifier">unpack</span>([<span class="ruby-identifier">r</span>])
  <span class="ruby-keyword">case</span> <span class="ruby-identifier">ty</span>
  <span class="ruby-keyword">when</span> <span class="ruby-constant">Array</span>
    <span class="ruby-keyword">case</span> <span class="ruby-identifier">ty</span>[<span class="ruby-value">0</span>]
    <span class="ruby-keyword">when</span> <span class="ruby-constant">TYPE_VOIDP</span>
      <span class="ruby-identifier">val</span> = <span class="ruby-identifier">val</span>.<span class="ruby-identifier">collect</span>{<span class="ruby-operator">|</span><span class="ruby-identifier">v</span><span class="ruby-operator">|</span> <span class="ruby-constant">Pointer</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">v</span>)}
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">when</span> <span class="ruby-constant">TYPE_VOIDP</span>
    <span class="ruby-identifier">val</span> = <span class="ruby-constant">Pointer</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">val</span>[<span class="ruby-value">0</span>])
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">val</span> = <span class="ruby-identifier">val</span>[<span class="ruby-value">0</span>]
  <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">if</span>( <span class="ruby-identifier">ty</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Integer</span>) <span class="ruby-operator">&amp;&amp;</span> (<span class="ruby-identifier">ty</span> <span class="ruby-operator">&lt;</span> <span class="ruby-value">0</span>) )
    <span class="ruby-keyword">return</span> <span class="ruby-identifier">unsigned_value</span>(<span class="ruby-identifier">val</span>, <span class="ruby-identifier">ty</span>)
  <span class="ruby-keyword">elsif</span>( <span class="ruby-identifier">ty</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Array</span>) <span class="ruby-operator">&amp;&amp;</span> (<span class="ruby-identifier">ty</span>[<span class="ruby-value">0</span>] <span class="ruby-operator">&lt;</span> <span class="ruby-value">0</span>) )
    <span class="ruby-keyword">return</span> <span class="ruby-constant">StructArray</span>.<span class="ruby-identifier">new</span>(<span class="ruby-keyword">self</span> <span class="ruby-operator">+</span> <span class="ruby-ivar">@offset</span>[<span class="ruby-identifier">idx</span>], <span class="ruby-identifier">ty</span>[<span class="ruby-value">0</span>], <span class="ruby-identifier">val</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-keyword">return</span> <span class="ruby-identifier">val</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-5B-5D-3D" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">[]=</span><span
                                class="method-args">(*args)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Set struct member <code>name</code>, to value <code>val</code>. If more arguments are specified, writes the string of bytes to the memory at the given <code>offset</code> and <code>length</code>.</p>

<p>Examples:</p>

<pre class="ruby"><span class="ruby-identifier">my_struct</span> = <span class="ruby-identifier">struct</span>([<span class="ruby-string">&#39;int id&#39;</span>]).<span class="ruby-identifier">malloc</span>
<span class="ruby-identifier">my_struct</span>[<span class="ruby-string">&#39;id&#39;</span>] = <span class="ruby-value">1</span>
<span class="ruby-identifier">my_struct</span>[<span class="ruby-value">0</span>, <span class="ruby-value">4</span>] = <span class="ruby-string">&quot;\x01\x00\x00\x00&quot;</span>.<span class="ruby-identifier">b</span>
<span class="ruby-identifier">my_struct</span>.<span class="ruby-identifier">id</span> <span class="ruby-comment"># =&gt; 1</span>
</pre>
                                <div class="method-calls-super">
                                  Calls superclass method
                                  <a href="Pointer.html#method-i-5B-5D-3D"><code>Fiddle::Pointer#[]=</code></a>
                              </div>

                              <div class="method-source-code" id="5B-5D-3D-source">
            <pre><span class="ruby-comment"># File fiddle/lib/fiddle/struct.rb, line 465</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">[]=</span>(<span class="ruby-operator">*</span><span class="ruby-identifier">args</span>)
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">super</span>(<span class="ruby-operator">*</span><span class="ruby-identifier">args</span>) <span class="ruby-keyword">if</span> <span class="ruby-identifier">args</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">&gt;</span> <span class="ruby-value">2</span>
  <span class="ruby-identifier">name</span>, <span class="ruby-identifier">val</span> = <span class="ruby-operator">*</span><span class="ruby-identifier">args</span>
  <span class="ruby-identifier">name</span> = <span class="ruby-identifier">name</span>.<span class="ruby-identifier">to_s</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">name</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Symbol</span>)
  <span class="ruby-identifier">nested_struct</span> = <span class="ruby-ivar">@nested_structs</span>[<span class="ruby-identifier">name</span>]
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">nested_struct</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">nested_struct</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">StructArray</span>)
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">val</span>.<span class="ruby-identifier">nil?</span>
        <span class="ruby-identifier">nested_struct</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">s</span><span class="ruby-operator">|</span>
          <span class="ruby-identifier">s</span>.<span class="ruby-identifier">replace</span>(<span class="ruby-keyword">nil</span>)
        <span class="ruby-keyword">end</span>
      <span class="ruby-keyword">else</span>
        <span class="ruby-identifier">val</span>.<span class="ruby-identifier">each_with_index</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">v</span>, <span class="ruby-identifier">i</span><span class="ruby-operator">|</span>
          <span class="ruby-identifier">nested_struct</span>[<span class="ruby-identifier">i</span>] = <span class="ruby-identifier">v</span>
        <span class="ruby-keyword">end</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">nested_struct</span>.<span class="ruby-identifier">replace</span>(<span class="ruby-identifier">val</span>)
    <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">return</span> <span class="ruby-identifier">val</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">idx</span> = <span class="ruby-ivar">@members</span>.<span class="ruby-identifier">index</span>(<span class="ruby-identifier">name</span>)
  <span class="ruby-keyword">if</span>( <span class="ruby-identifier">idx</span>.<span class="ruby-identifier">nil?</span> )
    <span class="ruby-identifier">raise</span>(<span class="ruby-constant">ArgumentError</span>, <span class="ruby-node">&quot;no such member: #{name}&quot;</span>)
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">ty</span>  = <span class="ruby-ivar">@ctypes</span>[<span class="ruby-identifier">idx</span>]
  <span class="ruby-identifier">packer</span> = <span class="ruby-constant">Packer</span>.<span class="ruby-identifier">new</span>([<span class="ruby-identifier">ty</span>])
  <span class="ruby-identifier">val</span> = <span class="ruby-identifier">wrap_arg</span>(<span class="ruby-identifier">val</span>, <span class="ruby-identifier">ty</span>, [])
  <span class="ruby-identifier">buff</span> = <span class="ruby-identifier">packer</span>.<span class="ruby-identifier">pack</span>([<span class="ruby-identifier">val</span>].<span class="ruby-identifier">flatten</span>())
  <span class="ruby-keyword">super</span>(<span class="ruby-ivar">@offset</span>[<span class="ruby-identifier">idx</span>], <span class="ruby-identifier">buff</span>.<span class="ruby-identifier">size</span>, <span class="ruby-identifier">buff</span>)
  <span class="ruby-keyword">if</span>( <span class="ruby-identifier">ty</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Integer</span>) <span class="ruby-operator">&amp;&amp;</span> (<span class="ruby-identifier">ty</span> <span class="ruby-operator">&lt;</span> <span class="ruby-value">0</span>) )
    <span class="ruby-keyword">return</span> <span class="ruby-identifier">unsigned_value</span>(<span class="ruby-identifier">val</span>, <span class="ruby-identifier">ty</span>)
  <span class="ruby-keyword">elsif</span>( <span class="ruby-identifier">ty</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Array</span>) <span class="ruby-operator">&amp;&amp;</span> (<span class="ruby-identifier">ty</span>[<span class="ruby-value">0</span>] <span class="ruby-operator">&lt;</span> <span class="ruby-value">0</span>) )
    <span class="ruby-keyword">return</span> <span class="ruby-identifier">val</span>.<span class="ruby-identifier">collect</span>{<span class="ruby-operator">|</span><span class="ruby-identifier">v</span><span class="ruby-operator">|</span> <span class="ruby-identifier">unsigned_value</span>(<span class="ruby-identifier">v</span>,<span class="ruby-identifier">ty</span>[<span class="ruby-value">0</span>])}
  <span class="ruby-keyword">else</span>
    <span class="ruby-keyword">return</span> <span class="ruby-identifier">val</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-assign_names" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">assign_names</span><span
                                class="method-args">(members)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Set the names of the <code>members</code> in this C struct</p>

                              <div class="method-source-code" id="assign_names-source">
            <pre><span class="ruby-comment"># File fiddle/lib/fiddle/struct.rb, line 349</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">assign_names</span>(<span class="ruby-identifier">members</span>)
  <span class="ruby-ivar">@members</span> = []
  <span class="ruby-ivar">@nested_structs</span> = {}
  <span class="ruby-identifier">members</span>.<span class="ruby-identifier">each_with_index</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">member</span>, <span class="ruby-identifier">index</span><span class="ruby-operator">|</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">member</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Array</span>) <span class="ruby-comment"># nested struct</span>
      <span class="ruby-identifier">member_name</span> = <span class="ruby-identifier">member</span>[<span class="ruby-value">0</span>]
      <span class="ruby-identifier">struct_type</span>, <span class="ruby-identifier">struct_count</span> = <span class="ruby-ivar">@ctypes</span>[<span class="ruby-identifier">index</span>]
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">struct_count</span>.<span class="ruby-identifier">nil?</span>
        <span class="ruby-identifier">struct</span> = <span class="ruby-identifier">struct_type</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">to_i</span> <span class="ruby-operator">+</span> <span class="ruby-ivar">@offset</span>[<span class="ruby-identifier">index</span>])
      <span class="ruby-keyword">else</span>
        <span class="ruby-identifier">structs</span> = <span class="ruby-identifier">struct_count</span>.<span class="ruby-identifier">times</span>.<span class="ruby-identifier">map</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">i</span><span class="ruby-operator">|</span>
          <span class="ruby-identifier">struct_type</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">to_i</span> <span class="ruby-operator">+</span> <span class="ruby-ivar">@offset</span>[<span class="ruby-identifier">index</span>] <span class="ruby-operator">+</span> <span class="ruby-identifier">i</span> <span class="ruby-operator">*</span> <span class="ruby-identifier">struct_type</span>.<span class="ruby-identifier">size</span>)
        <span class="ruby-keyword">end</span>
        <span class="ruby-identifier">struct</span> = <span class="ruby-constant">StructArray</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">to_i</span> <span class="ruby-operator">+</span> <span class="ruby-ivar">@offset</span>[<span class="ruby-identifier">index</span>],
                                 <span class="ruby-identifier">struct_type</span>,
                                 <span class="ruby-identifier">structs</span>)
      <span class="ruby-keyword">end</span>
      <span class="ruby-ivar">@nested_structs</span>[<span class="ruby-identifier">member_name</span>] = <span class="ruby-identifier">struct</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">member_name</span> = <span class="ruby-identifier">member</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-ivar">@members</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">member_name</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-set_ctypes" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">set_ctypes</span><span
                                class="method-args">(types)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Calculates the offsets and sizes for the given <code>types</code> in the struct.</p>

                              <div class="method-source-code" id="set_ctypes-source">
            <pre><span class="ruby-comment"># File fiddle/lib/fiddle/struct.rb, line 375</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">set_ctypes</span>(<span class="ruby-identifier">types</span>)
  <span class="ruby-ivar">@ctypes</span> = <span class="ruby-identifier">types</span>
  <span class="ruby-ivar">@offset</span> = []
  <span class="ruby-identifier">offset</span> = <span class="ruby-value">0</span>

  <span class="ruby-identifier">max_align</span> = <span class="ruby-identifier">types</span>.<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">type</span>, <span class="ruby-identifier">count</span> = <span class="ruby-value">1</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">orig_offset</span> = <span class="ruby-identifier">offset</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">type</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:entity_class</span>)
      <span class="ruby-identifier">align</span> = <span class="ruby-identifier">type</span>.<span class="ruby-identifier">alignment</span>
      <span class="ruby-identifier">type_size</span> = <span class="ruby-identifier">type</span>.<span class="ruby-identifier">size</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">align</span> = <span class="ruby-constant">ALIGN_MAP</span>[<span class="ruby-identifier">type</span>]
      <span class="ruby-identifier">type_size</span> = <span class="ruby-constant">SIZE_MAP</span>[<span class="ruby-identifier">type</span>]
    <span class="ruby-keyword">end</span>
    <span class="ruby-identifier">offset</span> = <span class="ruby-constant">PackInfo</span>.<span class="ruby-identifier">align</span>(<span class="ruby-identifier">orig_offset</span>, <span class="ruby-identifier">align</span>)

    <span class="ruby-ivar">@offset</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">offset</span>

    <span class="ruby-identifier">offset</span> <span class="ruby-operator">+=</span> (<span class="ruby-identifier">type_size</span> <span class="ruby-operator">*</span> <span class="ruby-identifier">count</span>)

    <span class="ruby-identifier">align</span>
  }.<span class="ruby-identifier">max</span>

  <span class="ruby-ivar">@size</span> = <span class="ruby-constant">PackInfo</span>.<span class="ruby-identifier">align</span>(<span class="ruby-identifier">offset</span>, <span class="ruby-identifier">max_align</span>)
<span class="ruby-keyword">end</span></pre>
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